I'd like to be able to copy artifacts from the last stable build of a job that was run with a given set of parameters. That is, for JOB1 with parameters PARAM1 and PARAM2, I'd like to be able to tell JOB2 to copy artifacts from the last build of JOB1 that had PARAM1=Bob,PARAM2=Alice. The existing syntax for specifying matrix jobs might be reusable, thus:

Project Name: JOB1/PARAM1=Bob,PARAM2=Alice

Bonus points for parameter expansion, so that JOB2's parameters could be used to make the selection:

Project Name: JOB1/PARAM1=$THISPARAM,PARAM2=$THATPARAM